Ceramic tile mold and green brick

Abstract

The ceramic tile mold comprises an upper mold core, a side plate and a lower mold core, a mold cavity is defined by the upper mold core, the side plate and the lower mold core, the upper mold core comprises an upper mold body, a mold edge flange and a gradual change connecting part, the mold edge flange is formed by protruding downwards from the peripheral edge of the upper mold body, and the mold edge flange is connected with the gradual change connecting part; the gradually-changing connecting part is connected to the upper die body and the die edge flange, and the section size of the gradually-changing connecting part is gradually reduced from the die edge flange to the inner side of the upper die body. According to the ceramic tile mold, through pressing of the mold edge flanges of the upper mold core, the four edges of a formed green brick sink, the compression amount of powder on the edges is larger and denser, the strength of the edges of the green brick can be improved, forward pressing forming of the green brick is achieved, edge milling and chamfering are not needed, meanwhile, the defect that powder adheres to the surface of the ceramic tile is overcome, the green brick production technological process is simplified, and the production efficiency is improved. The labor intensity of workers is relieved, and the production quality of ceramic tiles is improved.

Description

Technical Field

[0001] This application relates to the field of ceramic production technology, and more specifically, to a ceramic brick mold and brick blank. Background Technology

[0002] 750×1500mm slab ceramic tiles have become a hot-selling product in the building ceramics industry in the past two years. Their notable features include a golden ratio, clear and smooth textures, distinct layers, and a rich feel, enriching the visual experience of a space and making it more elegant and stylish. Building ceramics companies across the country are launching new production lines or upgrading existing ones to produce 750×1500mm slab ceramic tiles.

[0003] Currently, most building ceramic factories use reverse molding to press brick blanks for production. That is, the flat mold (upper mold core) is on the bottom and the back pattern mold (lower mold core) is on the top. The pressing and forming process includes: material distribution → pressing → pushing the blank → turning the blank 180° with the flat side facing up after turning → wiping the surface with the blank wiping machine (wiping away the powder adhering to the blank surface during the pushing process) → dust suction or blowing, and then proceeding to the next process.

[0004] Perhaps a small number of ceramic factories use traditional forward-pressing molds, that is, the flat mold is on top and the back pattern mold is below for pressing. The pressing and forming process includes: material distribution → pressing → pushing → receiving machine (the turning table does not rotate) → milling and chamfering the opposite edges → rotating / turning the brick blank 90° → milling and chamfering the other two opposite edges, and then proceeding to the next process.

[0005] If the reverse pressing mode is selected for the pressing and molding of large-format ceramic tile blanks such as 750×1500mm and 900×1800mm, at least the following defects will exist: 1. The upper mold core enters the mold cavity at a preset speed to compress the powder under the drive of the press's moving crossbeam, which will cause a small amount of powder to overflow onto the middle frame surface; 2. There is a gap between the upper mold core and the assembly side plate. The gap is mainly used for venting, to expel the air inside and between the compressed powder particles during pressing and molding, and to avoid the formation of interlayer defects in the blank. During pressing and molding, blank sharpness is generated at the gap, and some blank sharpness will be generated when the blank is ejected after demolding after pressing. 3. After pressing, start the next pressing cycle. First, push the blank material. During the pushing process, under the action of the blank's own weight and the pushing force of the material cart push plate, the blank surface (blank plane down) rubs against the middle frame surface, sticking some of the overflowing powder and blank tip to the blank surface. Even after wiping the surface with a cotton blanket from the blank wiping machine, it is difficult to completely solve the powder sticking defect. Especially when there are many sticky raw materials in the process formula and the ambient temperature is low, coupled with the large blank surface area, the powder sticking defect is difficult to remove effectively. In severe cases, it affects the rate of superior products by 2.0% for the whole month, thus seriously affecting the economic benefits of the enterprise.

[0006] If traditional die-casting is chosen, although the defect of powder sticking to the surface of the brick can be solved, the defect is that the brick blank formed by pressing is larger at the top and smaller at the bottom. During the multiple processes such as drying, inkjet printing, glazing, and polishing after pressing, the four sides of the brick blank are easily bumped and hit, resulting in chipping and cracking. Therefore, in order to prevent chipping and cracking of the brick blank, the edge of the brick blank needs to be milled and chamfered.

[0007] If the four edges of the brick blank are milled and chamfered, a centering device and special milling and chamfering equipment need to be purchased, and a high-speed synchronous motor should be selected for milling and chamfering, which is expensive; the milling and chamfering cutter head is a consumable and needs to be replaced after wear; the operator needs to observe the milling and chamfering effect frequently and make dynamic adjustments, which is labor-intensive. If the adjustment is not in place, it may cause the brick blank to crack and become a waste product after leaving the kiln; milling and chamfering the brick blank generates a lot of dust, the on-site working environment is poor and does not meet occupational health requirements, and the on-site equipment maintenance is also more difficult.

[0008] Therefore, existing technologies need to be improved. Utility Model Content

[0009] The purpose of this application is to provide a ceramic brick mold and brick blank, which aims to solve the technical problem in the prior art of how to ensure the edge strength of the brick blank so that the brick blank formed by direct pressing does not need to be milled and chamfered.

[0010] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0011] In a first aspect, this application provides a ceramic tile mold, comprising: an upper mold core, a side plate, and a lower mold core, wherein the upper mold core, the side plate, and the lower mold core enclose a mold cavity, and the upper mold core comprises:

[0012] Upper mold body;

[0013] The mold edge flange protrudes downward from the periphery of the upper mold body;

[0014] A gradient connecting part is provided, which connects the upper mold body and the mold edge flange. The cross-sectional dimension of the gradient connecting part gradually decreases from the mold edge flange toward the inner side of the upper mold body.

[0015] In one embodiment, the flange width of the die edge flange is 3.5-6mm.

[0016] In one embodiment, the flange height of the die edge flange is 0.6-1.0 mm.

[0017] In one embodiment, the gradient width of the gradient connection is 3-5 mm.

[0018] In one embodiment, the gradient connection portion includes a gradient inclined surface that extends from the surface of the mold edge flange to the surface of the upper mold body.

[0019] In one embodiment, the side plate is provided with a demolding ramp that is inclined toward one side of the mold cavity.

[0020] In one embodiment, the demolding ramp includes:

[0021] A first inclined surface extends downward from the top of the side plate, causing the side plate to tilt toward one side of the mold cavity;

[0022] A second inclined plane extends downward from the first inclined plane, and the inclination angle of the second inclined plane is greater than that of the first inclined plane.

[0023] In one embodiment, the first inclined plane has a first tilt angle, and the second inclined plane has a second tilt angle, wherein the first tilt angle is 2-3° and the second tilt angle is 10-12°.

[0024] Secondly, based on the ceramic brick blank mold described in the above embodiments, this application also provides a brick blank made by the ceramic brick blank mold, wherein the upper surface of the brick blank has a downward recessed edge around the perimeter, and the upper surface of the brick blank has an upward convex center, and the recessed edge and the convex center are connected by a gradually changing inclined surface.

[0025] The beneficial effects of the ceramic brick mold and brick blank provided in this application are at least as follows:

[0026] This application discloses a ceramic tile mold and a tile blank. The ceramic tile mold includes an upper mold core, a side plate, and a lower mold core, which together form a mold cavity. The upper mold core includes an upper mold body, a mold edge flange, and a gradient connecting part. The mold edge flange protrudes downward from the periphery of the upper mold body. The gradient connecting part connects the upper mold body and the mold edge flange, and the cross-sectional dimension of the gradient connecting part gradually decreases from the mold edge flange towards the inner side of the upper mold body. In this application, the ceramic tile mold, through the pressing of the mold edge flange of the upper mold core, forms a tile blank with its four sides sunken, resulting in greater and denser powder compression at the edges. This improves the edge strength of the tile blank, enables the tile blank to be pressed and formed without milling or chamfering, solves the defect of powder adhering to the surface of ceramic tiles, simplifies the tile blank production process, reduces the labor intensity of employees, and improves the quality of ceramic tile production. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a brick blank formed by pressing with a conventional ceramic brick mold according to an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the structure of the ceramic brick mold provided in the embodiments of this application;

[0030] Figure 3 A schematic diagram of a specific embodiment of the ceramic brick mold provided in this application;

[0031] Figure 4 This is a schematic diagram of the assembly structure of the ceramic tile mold provided in the embodiments of this application;

[0032] Figure 5 This is a schematic diagram of the pressing process of the ceramic tile mold provided in the embodiments of this application;

[0033] Figure 6 This is a schematic diagram of the structure of the brick blank provided in the embodiments of this application;

[0034] Figure 7 This is a partial three-dimensional rendering of the brick blank provided in the embodiments of this application.

[0035] The following are the labeling elements in the figure:

[0036] 100. Upper mold core; 200. Side plate; 300. Lower mold core; 400. Mold cavity; 500. Brick blank; 600. Wear-resistant rubber; 110. Upper mold body; 120. Mold edge flange; 130. Gradient connection part; 140. Upper mold magnetic suction plate; 210. Demolding slope; 211. First slope; 212. Second slope; 310. Lower mold magnetic suction plate; 320. Push plate; 330. Bottom plate; 510. Upper surface; 511. Sinking; 512. Protrusion; 513. Gradient slope; 520. Side surface; 521. First inclined edge; 522. Second inclined edge; θ 1 First tilt angle; θ 2 Second tilt angle; W 1 Flange width; W 2 Gradient width; H 1 Flange height; H 2 Second tilt height; H 3 First tilt height; S 1 First gap; S 2Second gap. Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0038] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0039] Example 1:

[0040] Please see Figure 2 This embodiment provides a ceramic brick mold, which includes: an upper mold core 100, a side plate 200 and a lower mold core 300. The upper mold core 100, the side plate 200 and the lower mold core 300 surround to form a mold cavity 400. The upper mold core 100 includes: an upper mold body 110, a mold edge flange 120 and a gradient connecting part 130. The mold edge flange 120 protrudes downward from the periphery of the upper mold body 110. The gradient connecting part 130 connects the upper mold body 110 and the mold edge flange 120. The cross-sectional size of the gradient connecting part 130 gradually decreases from the mold edge flange 120 to the inner side of the upper mold body 110.

[0041] Please see Figure 1 In the existing technology, the pressing and forming process of the brick blank 500 includes feeding → pressing → pushing → receiving machine → milling and chamfering the opposite sides → rotating / turning the brick blank 90° → milling and chamfering the other two opposite sides. The side plate 200 of the ceramic brick mold has a certain demolding slope. Only by ensuring a suitable demolding slope can the brick be demolded smoothly and without breaking the edges. Because of the demolding slope, the brick blank 500 is larger at the top and smaller at the bottom.

[0042] The conventional upper mold core 100 is a flat mold, with edges mostly using rounded arcs of approximately R6. However, the edge strength of the brick blank 500 formed by pressing it is insufficient, making the brick blank 500 prone to edge and surface chipping. Therefore, after the brick blank 500 is pressed, in order to prevent edge and surface chipping during multiple processes such as drying, inkjet printing, glazing, and polishing after pressing, a milling and chamfering process is required for the brick blank 500, which is a complex process.

[0043] In this embodiment, the upper mold core 100 includes an upper mold body 110, a mold edge flange 120, and a gradient connecting portion 130. During the pressing process, the mold edge flange 120 protrudes downward from the periphery of the upper mold body 110. The mold edge flange 120 allows the four sides of the brick blank 500 to sink 511, resulting in greater and denser compression of the powder at the edges of the brick blank 500, thus improving the strength of the edges of the brick blank 500. When the four sides of the brick blank 500 sink 511, the middle position of the brick blank 500 protrudes upward 512. During the pressing process, the gradient connecting portion 130 ensures a smooth transition between the sinking 511 and the protrusion 512, overcoming the defect of abrupt change between the sinking 511 and the protrusion 512.

[0044] Therefore, in this embodiment, the ceramic tile mold is pressed by the mold edge flange 120 of the upper mold core 100, and the resulting brick blank 500 has four sides sunk 511, resulting in greater and denser compression of the edge powder, which can improve the edge strength of the brick blank 500, realize the brick blank 500 to be pressed and formed without milling and chamfering, solve the defect of powder sticking to the surface of ceramic tiles, simplify the production process of brick blank 500, reduce the labor intensity of employees, and improve the production quality of ceramic tiles.

[0045] Optionally, the flange width W1 of the die edge flange 120 is 3.5-6mm.

[0046] For example, please see Figure 3 The flange width W1 of the die edge flange 120 can be 3.5-6mm, meaning it can be 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, or 6mm. The flange width W1 of the die edge flange 120 is equivalent to the width of the recessed 511 on all four sides of the brick blank 500. A width of 3.5-6mm for the die edge flange 120 allows for a better recessed 511 effect on the brick blank 500. For example, if the width of the die edge flange 120 is too small, resulting in a smaller recessed 511 width, the brick blank 500 will still experience edge and surface chipping during subsequent processes such as drying, inkjet printing, glazing, and polishing. Conversely, if the width of the die edge flange 120 is too large, the press needs to provide a higher load, and it does little to improve the edge strength of the brick blank 500, leading to continued edge and surface chipping.

[0047] Optionally, the flange height H1 of the die edge flange 120 is 0.6-1.0 mm.

[0048] For example, please see Figure 3 The flange height H1 of the die edge flange 120 can be 0.6-1.0mm, that is, the flange height H1 of the die edge flange 120 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1.0mm. 1 This is equivalent to a depth of 511mm on all four sides of a 500mm brick blank, and a flange height H of 120mm for the die edge flange. 1 With a thickness of 0.6-1.0mm, the brick blank 500 can achieve a better sinking effect 511. For example, when the height of the mold edge flange 120 is too small, that is, the depth of the brick blank 500 sinking 511 is small, the amount of powder compression at the edge is low, which does not have a significant effect on improving the edge strength of the brick blank 500, and the brick blank 500 will still have the problem of edge and surface chipping. When the height of the mold edge flange 120 is too small, that is, the depth of the brick blank 500 sinking 511 is large, resulting in a large protrusion 512 on the upper surface 510 of the brick blank 500. Although this can improve the edge strength, the large protrusion 512 will affect the use of the brick blank 500.

[0049] Optionally, the gradient width W2 of the gradient connection 130 is 3-5mm.

[0050] For example, please see Figure 3 The gradient width W2 of the gradient connection portion 130 can be 3-5mm, that is, 3mm, 4mm, or 5mm. The gradient connection portion 130 is equivalent to the transition surface between the recessed 511 and the central protrusion 512 on the brick blank 500. With a width of 3-5mm, the brick blank 500 can achieve a better recessed 511 effect. For example, for a 750×1500mm brick blank 500, the width of the recessed 511 on all four sides of the brick blank 500 is 3.5-6mm, and the gradient width W2 between the recessed 511 and the protrusion 512 is... 2 The thickness is 3-5mm. The central protrusion 512 of the brick blank 500 is pressed into a flat surface. This ensures that the central protrusion 512 of the brick blank 500 is the main body and does not affect the normal use of the ceramic tile. When the gradient width W of the gradient connection part 130... 2 When the size is small, this connection between the protrusion 512 and the recess 511 is too steep and abrupt, easily forming a step between the recess 511 and the protrusion 512, affecting the normal use of the ceramic tile; when the gradient width W of the gradient connection part 130 is... 2 When the area is too large, the area of ​​the protrusion 512 in the middle of the brick blank 500 becomes relatively small, which affects the usability of the main body of the brick blank 500.

[0051] Specifically, please refer to Figure 2 The gradient connection part 130 includes a gradient inclined body that extends from the surface of the mold edge flange 120 to the surface of the mold body 110.

[0052] In this embodiment, the gradual slope makes the transition between the depression 511 and the protrusion 512 of the brick blank 500 smooth and gradual, overcoming the defect of abrupt change between the depression 511 and the protrusion 512. For example, after pressing, the top of the depression 511 and the top of the protrusion 512 of the brick blank 500 are connected by a slope, overcoming the defect of abrupt change between the depression 511 and the protrusion 512, improving the edge strength, and avoiding edge chipping and breakage.

[0053] Specifically, please refer to Figure 3 The lower surface of the upper mold core 100 and the upper surface 510 of the lower mold core 300 are both provided with wear-resistant rubber 600 to protect the mold. Wear-resistant rubber 600 can be understood as prior art, and the specific structure of wear-resistant rubber 600 will not be described in detail.

[0054] Specifically, please refer to Figure 2 The side plate 200 is provided with a demolding slope 210 that is inclined toward the mold cavity 400.

[0055] In this embodiment, the powder is pressed to form a brick blank 500, and the side plate 200 is provided with a demolding slope 210 on one side of the mold cavity 400. The demolding slope 210 directly affects the smooth demolding of the brick blank 500 and the quality of the finished product. For example, the brick blank 500 formed in this way is larger at the top and smaller at the bottom, which makes it easy for the brick blank 500 to be pushed upward from the lower mold core 300 to complete the pushing process.

[0056] Specifically, please refer to Figure 2 The demolding slope 210 includes a first slope 211 and a second slope 212. The first slope 211 extends downward from the top of the side plate 200, causing the side plate 200 to tilt toward the mold cavity 400. The second slope 212 extends downward from the first slope 211, and the tilt angle of the second slope 212 is greater than the tilt angle of the first slope 211.

[0057] In this embodiment, the first inclined surface 211 is located on the upper part of the side plate 200. The first inclined surface 211 guides the brick blank 500 to open for demolding. When the lower mold core 300 opens and is pushed upward, the first inclined surface 211 first contacts the brick blank 500 and gradually separates the brick blank 500 from the mold. The angle of the first inclined surface 211 is usually small to reduce the friction during the initial demolding. Once the brick blank 500 moves along the first inclined surface 211, the second inclined surface 212 continues to guide the brick blank 500 to complete the demolding process. The second inclined surface 212 is located at the lower part of the side plate 200, so the friction at the position of the second inclined surface 212 is greater when the brick blank 500 is demolded. The inclination angle of the second inclined surface 212 is usually larger than that of the first inclined surface 211 in order to provide greater demolding force and ensure that the brick blank 500 can be completely separated from the mold. This design can improve demolding efficiency, reduce demolding time, thereby improving production efficiency, and avoid damage to the brick blank 500 during the demolding process, thus improving the production quality of the brick blank 500.

[0058] Optionally, the first inclined plane 211 has a first inclination angle θ1, and the second inclined plane 212 has a second inclination angle θ2. 2 First tilt angle θ 1 The second tilt angle is 2-3°. 2 It is 10-12°.

[0059] For example, please see Figure 3 The first inclined plane 211 has a first inclination angle θ1, and the second inclined plane 212 has a second inclination angle θ1. 2 First tilt angle θ 1 The second tilt angle is 2-3°. 2 The angle is 10-12°, where the total height of the side plate 200 is 24mm, the height of the first inclined surface 211 is 20.5mm, and the height of the second inclined surface 212 is 3.5mm. During the powder pressing process, the first inclination height H of the brick blank 500 on the first inclined surface 211 is... 3 The second inclined height H of the second inclined surface 212 is 5mm. 2 The thickness is 3.5mm. The first inclined surface 211 is located on the upper part of the side plate 200. The angle of the first inclined surface 211 is usually small to reduce the friction during initial demolding. The second inclined surface 212 is located on the lower part of the side plate 200. The inclination angle of the second inclined surface 212 is usually larger than that of the first inclined surface 211 in order to provide greater demolding force and ensure that the brick blank 500 can be completely separated from the mold.

[0060] For example, the flange width W1 of the die edge flange 120 is 3.5 mm, the flange height H1 of the die edge flange 120 is 0.7 mm, and the gradient width W of the gradient connection portion 130 is... 2The thickness is 3mm. The first inclination height H3 of the first inclined surface 211 of the brick blank 500 is 5mm, the second inclination height H2 of the second inclined surface 212 is 3.5mm, and the first inclination angle θ... 1 The second tilt angle is 2.5°. 2 The angle is 11.3°. The ceramic tile blank 500 formed by the pressing of this ceramic tile blank mold has four sides sunken 511, and the powder at the edge is compressed more and more densely, which can improve the edge strength of the tile blank 500. It can realize the positive pressing and forming of the tile blank 500 without milling and chamfering. At the same time, the side plate 200 has a certain demolding slope. Only by ensuring a suitable demolding slope can the demolding be smooth and prevent the demolding edge from breaking.

[0061] Example 2:

[0062] For the ceramic brick blank mold based on the above embodiments, please refer to... Figure 5 This application also provides a method for pressing ceramic tile molds, comprising the following steps:

[0063] S100, Fabric, pre-assemble the side plate 200 and the lower mold core 300 to form the mold cavity 400, and then the feeding mechanism sends the powder into the mold cavity 400.

[0064] S200, pressing: The powder is pressed by applying pressure through the upper mold core 100 to form a brick blank 500 ( Figure 6 As shown in the figure, the mold edge flange 120 of the upper mold core 100 is pressed downward, so that the four edges of the upper surface 510 of the brick blank 500 have a downward-sunken depression 511, and the middle of the upper surface 510 of the brick blank 500 is raised upward. The depression 511 and the protrusion 512 are connected by a gradual slope 513 to ensure the strength and density of the brick blank 500.

[0065] S300, push the blank. The upper mold core 100 moves upward away from the brick blank 500, and the lower mold core 300 pushes the brick blank 500 out upward. The feeding mechanism pushes the brick blank 500 out of the mold cavity 400, completing the demolding action and pushing the brick blank 500 out.

[0066] In step S100, please combine Figure 3 As shown, the side plate 200 and the lower mold core 300 are pre-assembled to form the mold cavity 400, such that a first gap S is provided between the side plate 200 and the lower mold core 300. 1 And a second gap S is reserved between the side plate 200 and the upper mold core 100. 2Then, the feeding mechanism delivers the powder into the mold cavity 400. For example, the range of the first gap S1 can be 0.1-0.5mm, and the range of the second gap S2 can be 0.1-0.5mm. Both the first gap S1 and the second gap S2 are used for venting. Since the powder is pulverized in the spray drying tower, the powder shape includes hollow particles, solid particles, wrinkled particles, solid particles, split particles, etc., and there are also gaps between the particles, which means there is air. Therefore, during the pressing process, the air needs to be vented; otherwise, it will accumulate inside the pressed blank and form a delamination defect, becoming a defective product. Preferably, the first gap S1... 1 The first gap can be 0.3mm, and the second gap S2 can be 0.24mm to allow for venting during pressing.

[0067] In step S200, the powder is pressed by applying pressure through the upper mold core 100. The powder can be pressed by applying pressure through the upper mold core 100 multiple times, for example, by pressing twice, three times, or five times.

[0068] During the two compressions, the first compression uses low pressure and the second compression uses high pressure. For example, the first compression pressure is 2.3 MPa and the second compression pressure is 25.2 MPa.

[0069] When applying pressure three times, please combine... Figure 4 As shown, during the first pressing, the upper mold core 100 can enter the mold cavity 400 by its own weight and press the powder, thus creating the first gap S. 1 Second gap S 2 Some gas is discharged; during the second pressing, low-pressure pressing can be used for compression, and then the upper mold core 100 is slightly raised to fully exhaust gas; during the third pressing, high-pressure pressing can be used to press the powder for the third time to form a brick blank 500, so that the mold edge flange 120 of the upper mold core 100 is pressed downward, so that the upper surface 510 of the brick blank 500 has a downward sinking 511 around its four edges, and the upper surface 510 of the brick blank 500 has an upward convex 512 in the middle. The sinking 511 and the convex 512 are connected by a gradual slope 513 to ensure the strength and density of the brick blank 500. For example, the pressing pressure of the second pressing is 2.3 MPa, and the pressing pressure of the third pressing is 25.2 MPa.

[0070] During the five compressions, the first compression uses low pressure, the second, third, and fourth compressions use medium pressure, and the fifth compression uses high pressure.

[0071] In this embodiment, the side plate 200 is fixed to the base plate 330 and remains stationary. The upper mold core 100 can move up and down, and the lower mold core 300 can also move up and down within a certain range.

[0072] During the material feeding process, taking three pressing steps as an example, the upper mold core 100 is magnetically attracted by the upper mold magnetic suction plate 140, and the lower mold core 300 is magnetically attracted by the lower mold magnetic suction plate 310. The side plate 200, the upper mold core 100, and the lower mold core 300 together form a mold cavity 400. The powder is fed into the mold cavity 400 by the feeding mechanism. Then, the upper mold magnetic suction plate 140 and the upper mold core 100 enter the mold cavity 400 to contact the powder and perform the first pressing under the drive of the press moving crossbeam. After that, the upper mold core 100 is slightly raised to release the compressed powder and then pressure is applied for the second pressing. After that, the upper mold core 100 is slightly raised again to release the compressed powder and then pressure is applied for the third pressing, until the brick blank 500 reaches sufficient strength and good density. After pressing, the upper mold core 100 moves upward away from the brick blank 500 and is pushed upward by the push plate 320, so that the lower mold core 300 pushes the brick blank 500 upward, and the feeding mechanism pushes the brick blank 500 out of the mold cavity 400 to enter the next process.

[0073] The side plate 200 has a certain draft angle to ensure smooth demolding and prevent chipped edges. For example, the side plate 200 includes a first inclined surface 211 and a second inclined surface 212. The first inclined surface 211 extends downward from the top of the side plate 200, causing the side plate 200 to tilt towards the mold cavity 400. The second inclined surface 212 extends downward from the first inclined surface 211. The first inclined angle θ of the first inclined surface 211 is... 1 The second inclination angle θ2 of the second inclined surface 212 is 10-12°, and the height of the second inclined surface 212 is 3.5mm. Because of the draft angle, the brick blank 500 is wider at the top and narrower at the bottom during the entire production line process, which can easily cause the edges and surfaces of the blank to chip or break. Therefore, it is necessary to set a mold edge flange 120 and a gradient connection part 130 in the upper mold core 100, so that the four sides of the upper surface 510 of the brick blank 500 sink 511, the edge powder is compressed more and more densely, which can improve the edge strength of the brick blank 500 and realize the brick blank 500 to be pressed and formed without milling and chamfering.

[0074] In one embodiment, the pressing method based on a ceramic brick blank mold in a specific embodiment of this application includes the following steps:

[0075] S11, Fabric: The side plate 200 and the lower mold core 300 are pre-assembled to form a mold cavity 400, so that the side plate 200 and the lower mold core 300 are provided with a first gap, and the side plate 200 and the upper mold core 100 are reserved with a second gap. Then the feeding mechanism sends the powder into the mold cavity 400.

[0076] S12, Pressing: The upper mold core 100 enters the mold cavity 400 for the first pressing. The powder is compressed for the first time by the main piston (not shown in the figure), the movable crossbeam (not shown in the figure), the upper mold magnetic suction plate 140, the weight of the upper mold core 100, and the compressed air pressure. Some gas is discharged through the first gap between the lower mold core 300 and the side plate 200, and the second gap between the upper mold core 100 and the side plate 200. The second pressing uses low-pressure pressing, further compressing the powder. Then, the upper mold core 100 is slightly raised for thorough venting. The three pressing processes employ high-pressure pressing, causing the mold edge flange 120 of the upper mold core 100 to be pressed downwards, so that the upper surface 510 of the brick blank 500 has a downward-sinking 511 around its perimeter, and the upper surface 510 of the brick blank 500 has an upward-protruding 512 in the middle. The sinking 511 and the protruding 512 are connected by a gradually changing slope 513 to ensure the strength and density of the brick blank 500. For example, the pressing pressure of the second pressing can be 2.3 MPa, and the pressing pressure of the third pressing can be 25.2 MPa.

[0077] S13. Pushing the blank: The upper mold core 100 moves upward away from the brick blank 500, and the lower mold core 300 pushes the brick blank 500 out upward. The feeding mechanism pushes the brick blank 500 out of the mold cavity 400, completing the demolding action and pushing the brick blank 500 out.

[0078] This embodiment improves the edge strength of ceramic tile blanks by 500 mm, preventing defects such as edge chipping and surface damage caused by minor bumps during the entire production line and kiln process. It simplifies the process flow, solves the problem of powder adhering to the ceramic tile surface, and eliminates the need for additional equipment such as centering milling and chamfering devices and blank wiping machines. This reduces the labor intensity of employees, improves the occupational health environment, increases the yield of high-quality products, thereby enhancing product market competitiveness and improving enterprise economic benefits.

[0079] Example 3:

[0080] For the ceramic brick blank mold based on the above embodiments, please refer to... Figure 6 This application also provides a brick blank 500 made by a ceramic brick blank mold, wherein the upper surface 510 of the brick blank 500 has a recessed 511 at the four edges, and the upper surface 510 of the brick blank 500 has an upward protrusion 512 in the middle, and the recessed 511 and the protrusion 512 are connected by a gradual slope 513.

[0081] In this embodiment, the four sides of the brick blank 500 are sunken 511, resulting in greater and denser compression of the powder at the edges. This improves the edge strength of the brick blank 500, enables the brick blank 500 to be pressed and formed without milling or chamfering, solves the defect of powder sticking to the surface of ceramic tiles, simplifies the production process of the brick blank 500, reduces the labor intensity of employees, and improves the production quality of ceramic tiles.

[0082] Please see Figure 6 and Figure 7 The side surface 520 of the brick blank 500 may have a first inclined edge 521 and a second inclined edge 522. The first inclined edge 521 is formed by pressing the first inclined surface 211 of the side plate 200, and the second inclined edge 522 is formed by pressing the second inclined surface 212 of the side plate 200, so that the side surface 520 of the brick blank 500 has a certain demolding slope, so as to demold smoothly and not cause the demolding edge to break.

[0083] For example, the width of the recessed portion 511 of the brick blank can be 3.5-6mm; the height of the protrusion of the brick blank can be 0.6-1.0mm; the width of the gradient slope 513 can be 3-5mm; the height of the first slope 521 can be 5mm; the height of the second slope 522 can be 3.5mm; the inclination angle of the first slope can be 2-3°; and the inclination angle of the second slope can be 10-12°.

[0084] In summary, this application discloses a ceramic tile mold and a tile blank. The ceramic tile mold includes an upper mold core, side plates, and a lower mold core, which together form a mold cavity. The upper mold core includes an upper mold body, a mold edge flange, and a gradient connecting part. The mold edge flange protrudes downward from the four edges of the upper mold body. The gradient connecting part connects the upper mold body and the mold edge flange, and the cross-sectional dimensions of the gradient connecting part gradually decrease from the mold edge flange to the inner side of the upper mold body. In this application, the ceramic tile mold, through the pressing of the mold edge flange of the upper mold core, forms a tile blank with four sides sunken, resulting in greater and denser powder compression at the edges. This improves the edge strength of the tile blank, enables the tile blank to be pressed and formed without milling or chamfering, solves the defect of powder adhering to the surface of ceramic tiles, simplifies the tile blank production process, reduces the labor intensity of employees, and improves the quality of ceramic tile production.

[0085] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A ceramic brick mold, characterized in that, include: An upper mold core, a side plate, and a lower mold core, wherein the upper mold core, the side plate, and the lower mold core enclose a mold cavity, and the upper mold core includes: Upper mold body; The mold edge flange protrudes downward from the periphery of the upper mold body; A gradient connecting part is provided, which connects the upper mold body and the mold edge flange. The cross-sectional dimension of the gradient connecting part gradually decreases from the mold edge flange toward the inner side of the upper mold body.

2. The ceramic brick mold as described in claim 1, characterized in that, The flange width of the die edge flange is 3.5-6mm.

3. The ceramic brick mold as described in claim 1, characterized in that, The flange height of the die edge flange is 0.6-1.0 mm.

4. The ceramic brick mold as described in claim 1, characterized in that, The gradient width of the gradient connection is 3-5mm.

5. The ceramic brick mold as described in claim 1, characterized in that, The gradient connection portion includes a gradient inclined surface that extends from the surface of the mold edge flange to the surface of the upper mold body.

6. The ceramic brick mold as described in claim 1, characterized in that, The side plate is provided with a demolding slope that is inclined toward one side of the mold cavity.

7. The ceramic brick mold as described in claim 6, characterized in that, The demolding slope includes: A first inclined surface extends downward from the top of the side plate, causing the side plate to tilt toward one side of the mold cavity; A second inclined plane extends downward from the first inclined plane, and the inclination angle of the second inclined plane is greater than that of the first inclined plane.

8. The ceramic brick mold as described in claim 7, characterized in that, The first inclined plane has a first inclination angle, and the second inclined plane has a second inclination angle, wherein the first inclination angle is 2-3° and the second inclination angle is 10-12°.

9. A brick blank made based on the ceramic brick mold according to any one of claims 1-8, characterized in that, The upper surface of the brick blank has a downward-sloping edge around its perimeter, and the upper surface of the brick blank has an upward-sloping center. The downward slope and the upward slope are connected by a gradually changing slope.

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